Blocking assembly for an automatic drafting device

Details Blocking assembly for an automatic drafting device Blocking assembly for an automatic drafting device

1977-05-03

1978-06-27

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346141, G01D 1516

Patent

active

040978745

ABSTRACT:
Automatic drafting device of the type employing a tubular writing pen, particularly an adjustable sealing element which is used against the writing tip of the pen when the pen is in a retracted rest mode. The sealing element is laterally disengaged from the pen tip when the pen is an extended writing mode. The sealing element which may be in the form of an elastic spheroid prevents drying out of ink within the capillary channel when the pen is not in use. The blocking assembly is characterized by its ability both to lock the tubular writing pen in its rest position and to lock the sealing element in its laterally outward position so as to avoid interference with the pen during temporary moments of non-writing.

REFERENCES:
patent: 1766249 (1930-06-01), Finch
patent: 2926058 (1960-02-01), Phillips, Jr.
patent: 3346869 (1967-10-01), Stone
patent: 3824603 (1974-07-01), Bates et al.
patent: 3839721 (1974-10-01), Chen et al.
patent: 3864695 (1975-02-01), Nagashima et al.
patent: 3945734 (1976-03-01), Woodbridge
patent: 3963337 (1960-12-01), Spalck

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